Granted Patent
Utility
US 4,102,389 · App. 05/732,674
Heat pump control system
Inventor:
Frank E. Wills
Patented Case
View Patent ↗
Granted: Jul 25, 1978
Filed: Oct 15, 1976
Inventor
Frank E. Wills
Assignee (at issue)
BorgWarner Inc.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.